KR100994839B1 - Semi stack mold - Google Patents

Abstract

PURPOSE: A semi-stack mold is provided to reduce a failure rate of products due to the inflow of foreign materials. CONSTITUTION: A semi-stack mold comprises a fixed axis mold(110), a middle mold(120) and a movable mold(130). The fixed axis mold comprises a sprue(111), a hot runner(114), first and second nozzles(115,116). The hot runner is horizontally formed on the sprue. The first and second nozzles are straightly arranged right under the hot runner. The first and second nozzles are connected to the hot runner. The middle mold is located at the lower part of the fixed axis mold.

Description

Semi Stack Mold

The present invention relates to an injection mold, and more particularly, by using an intermediate mold disposed between the fixed side mold and the movable side mold, two products can be simultaneously formed in one injection, and thus the productivity is excellent. It can smoothly supply molten resin, which is an injection raw material, to the cavity formed on both sides of the product, and can prevent the occurrence of product defects due to foreign substances in the resin. Simultaneous molding of two products by placing the molding surfaces of two products up and down It is a very economical and efficient semi-stack mold that can use a small-capacity injection machine because the injection molding force required at the time is small.

After attaching the mold to the injection molding machine, the molten resin is filled into the mold cavity of the product shape at the proper pressure and speed, and then the tool is made to cool and solidify the filled resin for a certain time to produce the molded product. It is also called a mold.

Such injection molds are classified into two-stage molds and three-stage molds according to the stage of opening the mold, and various molds or stack molds for molding several products simultaneously with one injection mold have already been disclosed. Recently, stack molds and multi-moulds, which can mold several products at the same time with a single injection operation, have been of continuous interest.

As related to such a stack mold or a multi mold, Korean Laid-Open Patent Publication No. 10-2010-0012799 "Multi Injection Mold and Its Injection Method", and Japanese Patent Application Laid-Open No. 2000-0000478 "A resin injection passage is taken out by a valve system. Stack mold systems for opening and closing, "Patent No. 0832908," Multi injection mold and method ", and Patent No. 0445221," The mold apparatus having a multi-stage detachable upper mold. "

In Unexamined Patent Publication No. 2000-0000478, "Stack mold system for opening and closing a resin injection passage by a valve system when taking out a product", after forming a cavity on both sides of an intermediate mold to supply a water support material into the inside of a central mold. Disclosed is a stack mold in which two products are molded at one time by embedding a manifold and a gate, respectively, and forming both sides. However, in the case of such a stack mold, not only the internal structure of the center mold is complicated, but also the discoloration of the product due to the high temperature of the hot runner is damaged due to the high temperature of the hot runner while passing through the manifold and the gate. There is a problem that there is a high possibility that the solidified resin foreign matter is fixed.

5 is a cross-sectional view illustrating a conventional multi-injection mold, wherein a rotating mold having a double-sided cavity is disposed between an upper first mold and a lower second mold, and the rotating mold is rotated to rotate different resin materials. Disclosed is a mold structure for molding a product of different materials by injection into a mold. To this end, in the multi-injection mold, the first and second runners extend from the first and second sprues to supply a water support fee to the cavity. However, in the case of the second sprue, the first transport pipe and the second transport pipe that are detachable between the second runner are installed to supply the support fee to the lower cavity of the rotational mold. Due to the narrow and long moving path, the length of the stagnation of resin is long, and the physical properties of the molten resin are changed and damaged due to the high temperature of the hot runner. In addition, a phenomenon that the end of the gate is worn out due to frictional contact with the gate formed at the end of the runner every time the rotation of the rotating mold occurs, and it is uneconomical to connect a separate injection cylinder to each runner. In addition, there is a problem that the resin solidified in the separation end surface of the first transfer pipe and the second transfer pipe is likely to penetrate through the separation end surface.

Patent Publication No. 10-2010-0012799 "Multi injection mold and its injection method" Korean Patent Laid-Open Publication No. 2000-0000478 "Stack mold system for opening and closing the resin injection passage by the valve system when taking out the product" Patent No. 0832908 "Multi Injection Mold and Method" Registered Patent No. 0445221 "Molding apparatus with multi-stage separate type mold"

The present invention was derived in recognition of the above-mentioned conventional problems, and an object of the present invention is to form a hot runner, a nozzle and a gate by considering the flow efficiency of the molten resin while simultaneously forming two products at a time. It is to provide a semi-stacked mold in which molten water support material is injected directly into the cavity to prevent resin solidification and prevent the possibility of foreign substances in the flow path.

In addition, in the present invention, even when molding two or more products, by using a single hot runner and the first and second nozzles extending vertically downward from the same, the support fee is directly supplied to the intermediate mold cavity at the same time. The injection molding force at the time of injection molding is applied to provide a semi stack mold designed to have a small injection capacity. In the present invention, it is possible to change the installation of the nozzle anywhere in the desired position inside the mold to propose a mold structure to be easily applied to various products.

In addition, in the present invention by optimizing the placement of the guide pin, return pin, eject plate, mill pin, take-out cylinder and stop bolt while reducing the size of the intermediate mold, the intermediate mold is prevented from sagging by the injection pressure, while the mold is opened and closed We want to provide a semi-stack mold designed to prevent shaking.

Particularly, in the present invention, the guide pin is capable of sliding the intermediate mold without flow and at the same time, stably supports the mold, thereby enabling the position of the mold without a separate auxiliary device, and by applying a parting lock and a stop bolt, Smooth sequential attachment is possible, and the ejection cylinder and the mill pin are optimized and arranged to minimize the size of the intermediate mold, thereby providing a semi-semi stack mold.

In the present invention, in order to solve the above-mentioned technical problem or to achieve the object,

A sprue connected to the injection cylinder is formed at the center of the upper surface, and a hot runner is formed in the horizontal direction so as to be biased to one side with respect to the sprue below the sprue, and straight line side by side directly below the hot runner. A fixed side mold disposed to form a first nozzle and a second nozzle respectively connected to the hot runner; An intermediate mold positioned at a lower portion of the fixed side mold and having a first cavity and a second cavity respectively formed on an upper surface and a lower surface thereof; And a movable side mold which is positioned below the intermediate mold so that the guide pin is upright on one side and is elevated by the ejector ejection device, wherein the lower gate of the first nozzle is straight to the upper end of the intermediate mold. And semi-mold stack mold, characterized in that the lower gate of the second nozzle extends in a straight line to the lower end of the intermediate mold.

Here, a stop bolt engaging hole is formed at a predetermined depth on one side of the upper surface of the intermediate mold, and the head bolt formed at the upper end of the stall bolt fixed to the movable side mold is slidably mounted to the stop bolt engaging hole. As a result, the intermediate mold is preferably pulled down by the stop bolt to be opened.

In addition, it is preferable that the fixed side mold is internally installed so that the eject plate slides up and down, and the fixed side ejection cylinder, in which the tip of the piston rod is connected to the eject plate, is internally positioned upstream of the eject plate.

On the other hand, it is preferable that the protective bush is mounted on the outer peripheral surface of the second nozzle.

According to the present invention, even though two products can be molded simultaneously due to one injection operation, the support fee can be supplied directly to the double-sided cavity of the intermediate mold without disconnection of the molten resin flow path, thereby reducing the defective rate of the product due to the inflow of foreign substances. By adopting a simpler structure of the hot runner and the nozzle structure extending from the upright, the amount of resin in the pipe is reduced, thereby minimizing the change in the physical properties of the resin due to high heat. In addition, since the amount of resin stagnation is small, there is little possibility of defects on the surface of the product and the surface is smoothly molded, and thus it can be applied to the molding of externally mounted exterior products.

In addition, according to the hot runner and the nozzle structure of the present invention, since the injection mold force of the mold for molding one product is applied, an injection machine having a low output power (injection capacity) can be applied, which is cost-effective and advantageous in terms of energy efficiency.

In addition, in the present invention by optimizing the placement of the guide pin, return pin, eject plate, mill pin, ejection cylinder and stop bolt to reduce the size of the intermediate mold, while reducing the weight of the intermediate mold sagging by the injection pressure, the mold is opened It can be prevented from shaking while closing.

Particularly, in the present invention, the guide pin is capable of sliding the intermediate mold without flow and at the same time, stably supports the mold, thereby enabling the position of the mold without a separate auxiliary device, and by applying a parting lock and a stop bolt, Smooth sequential attachment is possible, and the ejection cylinder and the mill pin are optimized and arranged to minimize the size of the intermediate mold, which is advantageous in lightening the mold as a whole.

1 is a schematic front sectional view of a semi stack mold of the present invention;
Figure 2 is a schematic front cross-sectional view showing a one-stage opening of the semi stack mold of the present invention.
Figure 3 is a schematic front cross-sectional view showing a two-stage mold opening of the semi stack mold of the present invention.
Figure 4 is a schematic front cross-sectional view showing a product take-out step of the semi stack mold of the present invention.
5 is a cross-sectional view showing a conventional multi-injection mold.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the configuration and operation of the present invention.

1 is a schematic front sectional view of the semi stack mold of the present invention, and FIGS. 2 to 4 are schematic front sectional views showing a step-by-step shape of the semi stack mold of the present invention.

 Semi-stack mold 100 of the present invention is largely intermediate mold disposed in the middle of the fixed side mold 110, the lower movable side mold 130 and the fixed side mold 110 and the movable side mold 130 Consists of 120.

The sprue 111 is connected to an injection cylinder (not shown) at the center of the upper end of the fixed side mold 110 to receive the molten resin raw material, and extends downward from one side of the sprue 111 to one side. Runner 114 is formed horizontally. The hot runner 114 is formed to be biased in one direction of the left side or the right side with respect to the center portion of the fixed side mold 110, thereby facilitating the arrangement of other components, such as a blowout cylinder, inside the mold on the opposite side. The application of the system (sequence system) has the advantage that it is easy to control the injection time of the first and second nozzles (115, 116).

 In this embodiment, the hot runner 114 and the first and second nozzles 115 and 116 are arranged to be biased to the left side of the fixed side mold 110. The first and second nozzles 115 and 116 are formed below the hot runner 114 to vertically branch downward from the hot runner 114.

The first nozzle 115 is formed to be embedded in the fixed mold 110 so that the gate of the lower end passes through the lower end of the fixed mold 110. Accordingly, the gate of the first nozzle 115 directly injects the resin material into the first cavity 121 of the intermediate mold 120 to be described later.

The second nozzle 116 extends downwardly longer than the first nozzle 115, and has a lower end penetrating the body of the intermediate mold 120, and a gate at the lower end of the nozzle has a lower end of the intermediate mold 120. Extend to face In this case, since the gate end of the second nozzle 116 repeats separation and contact with the intermediate mold every cycle of the mold, the protection bush 116a is mounted on the outer circumferential surface of the nozzle body to protect the valve gate. .

In the case of the fixed side mold 110, the fixed side take-out cylinder 113 is built in the inside of the mold to minimize the vertical height thereof, and the front end of the cylinder rod is connected to the eject plate 112. Therefore, the eject plate 112 slides up and down by the operation of the fixed side ejection cylinder 113.

As shown in the eject plate 112, a fixed side pin 104a for taking out the molded product 141 is mounted, and a fixed side return pin 117 is mounted laterally. In the drawings, reference numeral 118 denotes a parting lock for preventing the mold from being opened by frictional force, and reference numeral 119a denotes a guide pin guide hole for slidingly guiding the guide pin 131 of the movable side mold 130. Reference numeral 119b denotes a stop bolt guide hole.

The first cavity 121 and the second cavity 122 are formed on the upper and lower surfaces of the intermediate mold 120, respectively, to simultaneously injection molding two kinds of products 141 and 142. The shape of the first cavity 121 and the second cavity 122 may be the same or different shapes depending on the shape of the product to be injection molded. In this embodiment, the shapes of the molded products 141 and 142 which are simultaneously injected are assumed to be different.

On the intermediate mold 120 corresponding to the stop bolt guide hole 119b of the fixed side mold 110, a stop bolt engaging hole 124b is formed at a predetermined depth from the upper end surface of the intermediate mold 120 toward the inside. A stop bolt 123 to be described later is interpolated in the stop bolt locking hole 124b, and the top head 123b of the stop bolt 123 is formed on the bottom surface of the stop bolt locking hole 124b. The head 123b formed at the top of the stop bolt 123 is formed larger than the diameter of the stop bolt body 123a.

The lower end of the stop bolt 123 body 123a is fixedly coupled to the movable side mold 130 to be described later. In the drawings, reference numeral 124a denotes a guide pin guide hole.

The guide pin 131 is vertically formed upwardly on the movable side mold 130, so that the guide pin guide hole 119a of the fixed side mold 110 and the guide pin guide hole 124a of the intermediate mold 120 are formed. Guided and lifted inside.

Eject plate 132 is mounted to the movable side mold 130 to move up and down as shown in the figure, and is moved up and down by an ejector ejection device (not shown). The ejection plate 132 is equipped with a movable side pin 132a to take out the product 142. In the figure, reference numeral 137 denotes a movable return pin.

2 shows a step in which the semi-stack mold 100 of the present invention is first opened, in which the mold is opened by the stroke of the stop bolt 123. As shown in FIG. 1, the stop bolt 123 accommodated in the stop bolt guide hole 119b of the fixed mold 110 is lowered to the bottom surface of the stop bolt engaging hole 124b of the intermediate mold 120. It's a step that takes. In this step, the intermediate mold 120 maintains the state in which it is coupled to the stationary mold 110, and only the movable side mold 130 is released from the intermediate mold 120.

Figure 3 shows the semi-stage opening step of the semi-stacked mold 100 of the present invention, in this step the intermediate mold 120 is lowered by the stop valve 123 to the fixed side mold 110 The bond is released. That is, when the movable side mold 130 descends, the intermediate mold 120 is forcibly pulled down by the stop valve 123 caught on the bottom surface of the stop valve engaging hole 124b.

Figure 4 shows the step of taking out the product from the mold surface after the second mold opening of the mold by the upper and lower eject plate (112,132) to move the fixed side pin (112a) and the movable side pin (132a) to take out the product. do. The fixed side ejection plate 112 is lifted up and down by the fixed side ejection cylinder 113 embedded in the fixed side mold 110, and the movable side ejection plate 132 is lifted up and down by the ejector ejection apparatus (not shown). do.

According to the semi-stack mold 100 of the present invention, the resin material can be smoothly supplied to the first and second cavities 121 and 122 of the intermediate mold 120, and there is no room for foreign substances to intervene during the supply of the resin. Will be lowered. In addition, since the structure of the hot runner, the nozzle and the gate is simplified to an integrated straight structure, the change of the physical properties of the resin can be prevented due to the small amount of time and amount of resin stagnating in the flow path, thereby making the surface of the resin product uniform. It can be applied to exterior products.

In addition, since the intermediate mold 120 of the present invention does not need to form a separate manifold inside, the thickness can be manufactured thinly and lightly. Simultaneous molding of the two products is possible.

In the present invention as described above, the guide pin is capable of sliding the intermediate mold without flow, and at the same time serves to stably support the mold, thereby enabling the position of the mold without a separate auxiliary device, and by applying a parting lock and a stop bolt, Smooth sequential attachment is possible, and by inserting the ejection cylinder into the mold and optimizing the eject plate and the pin, the size of the intermediate mold can be minimized to provide a light weight injection mold.

In the embodiment of the present invention, the injection molding of the two products at the same time using the first cavity 121 and the second cavity 122 on both sides of the intermediate mold 120, but the example of the intermediate mold 120 Depending on how the cavity is formed on both the upper and lower sides, two or more products can be formed simultaneously. In this case, the configuration and principle described in the embodiments of the present invention are applied as it is, but only the shape of the cavity is changed.

The present invention relates to a mold apparatus capable of efficiently simultaneous injection molding of two products at a time, which enables compacting of the mold apparatus, and does not require an increase in the capacity of the injection cylinder, Since the gate is designed in a straight one-piece structure, problems such as mixing of foreign matters and cooling solidification of the resin can be improved. Therefore, when applied to the injection molding related fields will contribute to the improvement of product productivity and quality.

100: semi-stack mold 110: fixed side mold
111: sprue 112: eject plate
112a: fixed side mill pin 113: fixed side ejection cylinder
114: hot runner 115: first nozzle
116: second nozzle 117: fixed side return pin
118: parting lock 119a: guide pin guide hole
119b: stop bolt guide hole 120: intermediate mold
121: first cavity 122: second cavity
123: stop bolt 124a: guide pin guide hole
124b: stop bolt engaging hole 130: movable mold
131: guide pin 132: eject plate
132a: movable side pin 137: movable side return pin

Claims (4)

A sprue connected to the injection cylinder is formed at the center of the upper surface, and a hot runner is formed in the horizontal direction so as to be biased to one side with respect to the sprue below the sprue, and straight line side by side directly below the hot runner. A fixed side mold disposed to form a first nozzle and a second nozzle respectively connected to the hot runner;
An intermediate mold positioned at a lower portion of the fixed side mold and having a first cavity and a second cavity respectively formed on an upper surface and a lower surface thereof; And
Located below the intermediate mold is configured to include a movable side mold which is formed so that the guide pin upright on one side and is elevated by the ejector ejection device,
Semi-mold mold, characterized in that the bottom gate of the first nozzle extends in a straight line to the top of the intermediate mold, the bottom gate of the second nozzle extends in a straight line to the bottom of the intermediate mold. The method of claim 1,
A stop bolt engaging hole is formed at a predetermined depth on one side of the upper surface of the intermediate mold, and the stop bolt engaging hole is slidably mounted by a head formed at an upper end of a stall bolt fixed to the movable side mold by a lower end of the body. Semi-stacked mold, characterized in that the intermediate mold is pulled down by the lowering of the bolt to open. The method according to claim 1 or 2,
The semi-stacked mold is installed in the fixed side mold so that the eject plate is slid and lifted, and the fixed side blow-out cylinder in which the tip of the piston rod is connected to the eject plate is located above the eject plate. The method of claim 3,
Semi-semi stack mold, characterized in that the protective bush is mounted on the outer peripheral surface of the second nozzle.

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